All restorations were made indirectly on a plaster model using unidirectional E-glass fibers (Vectris- Ivoclar Vivadent, liechtenstein) in combination with a laboratory resin composite (Signum, Heraeus-Kulzer) and cemented according to the instructions of resin cement Variolink II (Ivoclar Vivadent). After baseline recordings, patients were followed at 6 months and thereafter annually up to 15 years. The evaluation protocol involved technical (chipping, debonding or fracture of tooth/restoration) and biological failures (caries).